Pin Python setuptools
in the CI to fix integration tests
#4296
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Closes #4294. More details are presented here (and in the referenced issue): #4294 (comment). The proper solution for this would be awaiting numpy to pin the dependency since they are the ones using setuptools (even though we install it, just as a build time dependency) but since that might take a while this simply ensures that the CI is unblocked. If/when upstream is fixed, we can then remove this pin and update our numpy version.